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Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –

Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 32PS: Nitrogen gas is confined in a cylinder with a movable piston under a constant pressure of 9.95 104...
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Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –
Transcribed Image Text:Question: A gas is contained in a piston-and-cylinder system, oriented vertically. On top of the cylinder there is a mass. When the gas is heated it expands, and the mass is lifted. The energy used to lift the mass is exactly the same as the energy absorbed from the heater. What are the signs for q, w and AU, respectively? A. q = +; w = +; AU = + B. q = +; w = -;AU = 0 C. q = -; w= +;AU = 0 D. q = -; w= - ;AU = –
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